1. 

   tony1851

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   Eh? - you might be thinking of timber, which does sag over time; with a steel beam, any deflection is usually instantaneous and final.

    

   tony1851, 4 Nov 2019

   #16

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3. 

   tony1851

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   @op - a 152 x 89 UB (steel beam) will be more than adequate on that span.

    

   tony1851, 4 Nov 2019

   #17

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